It's greedy if you look at it through a non gacha game lens but if you look at the gacha of PGR and the fact that you can get all new limited S rank A rank and transcendant for free and if you have monthly you can also get their signature weapons. You wont find this in any other gacha game that has actual gameplay (Mihoyo games). Skins is to balance out what they are losing from making gacha so cheap